The earliest production date I have is S-8-20, & the latest is S-7-46.
Most of the Hy-Lo's came unpainted from the factory (part of the LO cost), but many of the utility marked lanterns came painted any number of colors and shades depending on the customers requests. More than half of mine are unpainted including the utility marked ones. Black seems to be the most popular color, then red. I have a few examples with these colors; Gold, Orange, Silver, White, Yellow, & Gray-Green Metallic.
None of the typical Dietz factory colors are in my collection of Hy-Lo's.